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Business Combinations - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended
May 29, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
May 29, 2014
Dec. 31, 2013
May 29, 2014
Schuff [Member]
Jun. 30, 2014
Schuff [Member]
Jun. 30, 2014
Schuff [Member]
May 29, 2014
Schuff [Member]
Business Acquisition [Line Items]                      
Acquisition date                   May 29, 2014  
Number of shares of common stock acquired           2,500,000         2,500,000
Additional number of shares acquired 198,411             198,411      
Percentage of ownership interest acquired           65.00%     70.00% 70.00% 65.00%
Business acquisition purchase price valued per share                     $ 31.50
Non-controlling interest ownership percentage                     35.00%
Acquisition resulted in goodwill   $ 27,911,000   $ 27,911,000     $ 3,378,000   $ 24,533,000 $ 24,533,000  
Transaction cost incurred in acquisition                 300,000 300,000  
Revenue   96,586,000 58,621,000 139,940,000 117,410,000       54,500,000    
Net income   $ (3,561,000) $ 137,358,000 $ (8,508,000) $ 134,146,000       $ 2,500,000